System message transmission method and device

ABSTRACT

Provided are a system message transmission method and device, which relate to the field of wireless communications. According to the system message transmission method, a system message is transmitted at a preset resource location; and a physical downlink channel is transmitted according to the system message. The system message may include at least one of: frequency domain location information of a system, configuration information of a physical shared channel carrying a system message, configuration information of terminal access, available resource information of the physical downlink channel, and radio frame information.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.15/757,152 which was filed on Mar. 2, 2018 under 35 U.S.C. 371 as thenational stage of International Patent Application NumberPCT/CN2016/097379 which was filed on Aug. 30, 2016 claiming priority toChinese Patent Application 201510557207.3 filed on Sep. 2, 2015 andChinese Patent Application 201510567936.7 filed on Sep. 8, 2015, thecontents of all of said applications are herein incorporated byreference in their entirety.

TECHNICAL FIELD

The disclosure relates to, but is not limited to, the field of wirelesscommunications, and more particularly to a system message transmissionmethod and device.

BACKGROUND

A Machine Type Communication (MTC) User Equipment (UE), which is alsoreferred to as a Machine to Machine (M2M) user communication equipment,is a main application form of a current Internet Of Things (IOT). In a3rd Generation Partnership Project (3GPP) technical report TR45.820V200,several technologies applicable to a Cell-IOT (C-IOT) are proposed.Among all the technologies, a Narrowband Long Term Evolution (NB-LTE)technology is the most attention-grabbing technology. The systembandwidth of an NB-LTE system is 200 kHz, identical to the channelbandwidth of a Global System for Mobile Communication (GSM), whichbrings great convenience for reusing a GSM spectrum by an NB-LTE systemand reducing mutual interference between a neighbor channel and a GSMchannel. In addition, the transmission bandwidth of the NB-LTE and adownlink subcarrier interval are 180 kHz and 15 kHz respectively,identical to the bandwidth and subcarrier interval of one PhysicalResource Block (PRB) of an LTE system respectively. This not onlyfacilitates reuse of relevant designs of the relevant LTE system in theNB-LTE system, but also reduces mutual interference between the twosystems when a GSP spectrum reused by the NB-LTE system is adjacent to aspectrum of the LTE system. In addition, a subcarrier interval of therelevant LTE system is 15 kHz. The LTE system supports the following sixsystem bandwidths, i.e., 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz and 20MHz, and these six bandwidths respectively have 72, 150, 300, 600, 900and 1200 available subcarriers. Considering that the transmissionbandwidth and downlink subcarrier interval of the NB-LTE system are thesame as the bandwidth and subcarrier interval of one PRB of the LTEsystem respectively, the NB-LTE system and the LTE system may coexist inthe same spectrum. For example, in the LTE system of which the systembandwidth is 20 MHz, a bandwidth of 180 kHz may be allocated for sendingan NB-LTE system signal. However, because partial resources of the LTEsystem have been pre-occupied, an effective solution for ensuring thatNB-LTE system and LTE system signals are not transmitted over the sameresource so as to reduce mutual interference between the two systems isnot provided yet at present.

SUMMARY

The following is a brief introduction for subject matter describedherein in detail. The brief introduction is not intended to restrict thescope of protection of claims.

Some embodiments of the disclosure provide a system message transmissionmethod and device, which may reduce the interference between signalsduring spectrum sharing between different systems, and reduce theoccurrence of simultaneous transmission of different signals over thesame resource by different systems.

Some embodiments of the disclosure adopt the technical solutions asfollows.

A system message transmission method may include the steps as follows.

A system message may be transmitted at a preset resource location.

A physical downlink channel may be transmitted according to the systemmessage. The system message may include at least one of: frequencydomain location information of a system, configuration information of aphysical shared channel carrying a system message, configurationinformation of terminal access, available resource information of thephysical downlink channel, and radio frame information.

In an embodiment, the available resource information of the physicaldownlink channel may include: information of a start OrthogonalFrequency Division Multiplexing (OFDM) symbol of the physical downlinkchannel in a subframe, and/or information of one or more unavailableresource elements of the physical downlink channel in a subframe, and/orinformation of one or more available subframes of the physical downlinkchannel.

In an embodiment, the method may further include a step of indicatingthe information of the one or more unavailable resource elements via aCell-specific Reference Signal (CRS) port location and/or a ChannelState Information Reference Signal (CSI-RS) port location. Theindication via the CRS port location and/or the CSI-RS port location maybe determined by a number of ports and/or a virtual cell identity.

In an embodiment, the system message may be transmitted at the presetresource location in a following manner.

The system message may be transmitted at a preset resource location viaa Physical Broadcast Channel (PBCH).

In an embodiment, the preset resource location may be embodied as one ofthe followings. The PBCH may be located on last Y OFDM symbols of afirst slot of a subframe and first X OFDM symbols of a second slot ofthe subframe. Alternatively, the PBCH may be located on any R OFDMsymbols in first predefined OFDM symbols in a subframe, wherein R may beequal to 4, 5, 6 or 8, and the first predefined OFDM symbols may includeat least one of: a second OFDM symbol of each slot, a third OFDM symbolof each slot, a fourth last OFDM symbol of each slot, and last two OFDMsymbols of each slot.

In an embodiment, X may be equal to 4, 5, 6 or 7, and Y may be equal to0, 1, 2, 3, 4 or 5.

In an embodiment, the first predefined OFDM symbols may include one ofthe following:

-   -   when R is equal to 4, the first predefined OFDM symbols may        include last two OFDM symbols of each slot;    -   when R is equal to 5, the first predefined OFDM symbols may        include last two OFDM symbols of each slot and a fourth last        OFDM symbol of a second slot, or, the first predefined OFDM        symbols may include last two OFDM symbols of each slot and a        third OFDM symbol of a second slot;    -   when R is equal to 6, the first predefined OFDM symbols may        include last two OFDM symbols of each slot, and a fourth last        OFDM symbol and a second OFDM symbol of a second slot, or, the        first predefined OFDM symbols may include last two OFDM symbols        of each slot and a fourth last OFDM symbol of each slot, or, the        first predefined OFDM symbols may include last two OFDM symbols        of each slot, and a second OFDM symbol and a third OFDM symbol        of a second slot; and    -   when R is equal to 8, the first predefined OFDM symbols may        include a second OFDM symbol, a third OFDM symbol and last two        OFDM symbols of each slot.

In an embodiment, the PBCH and a synchronization channel may be locatedon adjacent subframes.

In an embodiment, the PBCH and the synchronization channel may belocated on adjacent subframes which may be embodied as one of thefollowing:

-   -   the synchronization channel may be located on a subframe #9, and        the PBCH may be located on a subframe #0;    -   the synchronization channel may be located on a subframe #0, and        the PBCH may be located on a subframe #9;    -   the synchronization channel may be located on a subframe #8, and        the PBCH may be located on a subframe #9;    -   the synchronization channel may be located on a subframe #6, and        the PBCH may be located on a subframe #5;    -   the synchronization channel may be located on a subframe #4, and        the PBCH may be located on a subframe #5;    -   the synchronization channel may be located on a subframe #5, and        the PBCH may be located on a subframe #4;    -   the synchronization channel may be located on a subframe #3, and        the PBCH may be located on a subframe #4; and    -   the synchronization channel may be located on a subframe #1, and        the PBCH may be located on a subframe #0.

In an embodiment, the preset resource location may be embodied asfollows. The PBCH may be mapped to T radio frames, and may be located onthe same one or more subframes of each radio frame, wherein T may beequal to 3, 6, 9, 18 or 36.

In an embodiment, the one or more subframes may include one or more of:a subframe #0 of a radio frame, a subframe #4 of a radio frame, asubframe #5 of a radio frame, or a subframe #9 of a radio frame.

In an embodiment, the PBCH may be transmitted at an interval of Z1 radioframes, and may be repeatedly transmitted for Z2 times by every Z1*Z2radio frames.

In an embodiment, Z1 may be equal to 4, 6, 8, 12 or 24, and Z2 may beequal to 4, 6, 8, 12 or 16.

In an embodiment, the PBCH may be demodulated by using a narrowbandreference signal. The narrowband reference signal may be transmitted onone or more subframes for transmitting the PBCH, and the narrowbandreference signal may be transmitted on second predefined OFDM symbols.Herein, the second predefined OFDM symbols may include last two OFDMsymbols of each slot in a subframe, or, each OFDM symbol fortransmitting the PBCH.

In an embodiment, the system message may be transmitted at the presetresource location in one of the following manners.

The system message may be transmitted at the preset resource locationvia a physical shared channel, or the system message may be transmittedat the preset resource location via a physical shared channel and aPBCH.

In an embodiment, the system message may be transmitted at the presetresource location via the physical shared channel in a manner asfollows.

A start OFDM symbol of a physical shared channel carrying the systemmessage in a subframe may be a fixed value, and corresponding availableresource elements may be remaining resources after a fixed virtual cellCRS port is removed.

In an embodiment, the physical shared channel carrying the systemmessage, a synchronization channel and the PBCH may be located ondifferent subframes.

In an embodiment, one or more subframes of the physical shared channelcarrying the system message may include one or more of a subframe #0, asubframe #4, a subframe #5 and a subframe #9.

In an embodiment, the configuration information of the physical sharedchannel carrying the system message may include at least one of:

-   -   a number of bits for carrying the system message in the physical        shared channel;    -   a number of subframes occupied by the physical shared channel;        and    -   information of one or more radio frames occupied by the physical        shared channel.

In an embodiment, the configuration information of terminal access mayinclude:

-   -   whether terminal access is allowed, and/or system state        information, and/or configuration information of terminal uplink        access resources, wherein the system state information may be        used for a terminal to determine whether and/or how to access        the system.

Some embodiments of the disclosure also provide a system messagetransmission device. The device may include a system module and achannel module.

The system module may be configured to transmit a system message at apreset resource location.

The channel module may be configured to transmit a physical downlinkchannel according to the system message. The system message may includeat least one of: frequency domain location information of a system,configuration information of a physical shared channel carrying a systemmessage, configuration information of terminal access, availableresource information of the physical downlink channel, and radio frameinformation.

In an embodiment, the available resource information of the physicaldownlink channel may include: information of a start OFDM symbol of thephysical downlink channel in a subframe, and/or information of one ormore unavailable resource elements of the physical downlink channel in asubframe, and/or information of one or more available subframes of thephysical downlink channel.

The device may further include an indication module. The indicationmodule may be configured to indicate the information of the one or moreunavailable resource elements via a CRS port location and/or a CSI-RSport location. The indication via the CRS port location and/or theCSI-RS port location may be determined by a number of ports and/or avirtual cell identity.

In an embodiment, the system module may be configured to transmit asystem message at a preset resource location in a following manner.

The system module may be configured to transmit the system message atthe preset resource location via a PBCH.

In an embodiment, the preset resource location may be embodied as one ofthe followings. The PBCH may be located on last Y OFDM symbols of afirst slot of a subframe and first X OFDM symbols of a second slot ofthe subframe. Alternatively, the PBCH may be located on any R OFDMsymbols in first predefined OFDM symbols in a subframe, wherein R isequal to 4, 5, 6 or 8, and the first predefined OFDM symbols may includeat least one of: a second OFDM symbol of each slot, a third OFDM symbolof each slot, a fourth last OFDM symbol of each slot, and last two OFDMsymbols of each slot.

In an embodiment, X may be equal to 4, 5, 6 or 7, and Y may be equal to0, 1, 2, 3, 4 or 5.

In an embodiment, the first predefined OFDM symbols may include one ofthe following:

-   -   when R is equal to 4, the first predefined OFDM symbols may        include last two OFDM symbols of each slot;    -   when R is equal to 5, the first predefined OFDM symbols may        include last two OFDM symbols of each slot and a fourth last        OFDM symbol of a second slot, or, the first predefined    -   OFDM symbols may include last two OFDM symbols of each slot and        a third OFDM symbol of a second slot;    -   when R is equal to 6, the first predefined OFDM symbols may        include last two OFDM symbols of each slot, and a fourth last        OFDM symbol and a second OFDM symbol of a second slot, or, the        first predefined OFDM symbols may include last two OFDM symbols        of each slot and a fourth last OFDM symbol of each slot, or, the        first predefined OFDM symbols may include last two OFDM symbols        of each slot, and a second OFDM symbol and a third OFDM symbol        of a second slot; and    -   when R is equal to 8, the first predefined OFDM symbols may        include a second OFDM symbol, a third OFDM symbol and last two        OFDM symbols of each slot.

In an embodiment, the PBCH and a synchronization channel may be locatedon adjacent subframes.

In an embodiment, the PBCH and the synchronization channel may belocated on adjacent subframes which may be embodied as one of thefollowing:

-   -   the synchronization channel may be located on a subframe #9, and        the PBCH may be located on a subframe #0;    -   the synchronization channel may be located on a subframe #0, and        the PBCH may be located on a subframe #9;    -   the synchronization channel may be located on a subframe #8, and        the PBCH may be located on a subframe #9;    -   the synchronization channel may be located on a subframe #6, and        the PBCH may be located on a subframe #5;    -   the synchronization channel may be located on a subframe #4, and        the PBCH may be located on a subframe #5;    -   the synchronization channel may be located on a subframe #5, and        the PBCH may be located on a subframe #4;    -   the synchronization channel may be located on a subframe #3, and        the PBCH may be located on a subframe #4; and    -   the synchronization channel may be located on a subframe #1, and        the PBCH may be located on a subframe #0.

In an embodiment, the preset resource location may be embodied asfollows. The PBCH may be mapped to T radio frames, and may be located onthe same one or more subframes of each radio frame, wherein T may beequal to 3, 6, 9, 18 or 36.

In an embodiment, the one or more subframes may include one or more of:a subframe #0 of a radio frame, a subframe #4 of a radio frame, asubframe #5 of a radio frame, or a subframe #9 of a radio frame.

In an embodiment, the PBCH of the system module may be transmitted at aninterval of Z1 radio frames, and may be repeatedly transmitted for Z2times by every Z1*Z2 radio frames.

In an embodiment, Z1 may be equal to 4, 6, 8, 12 or 24, and Z2 may beequal to 4, 6, 8, 12 or 16.

In an embodiment, the PBCH may be demodulated by using a narrowbandreference signal. The narrowband reference signal may be transmitted onone or more subframes for transmitting the PBCH, and the narrowbandreference signal may be transmitted on second predefined OFDM symbols.Herein, the second predefined OFDM symbols may include last two OFDMsymbols of each slot in a subframe, or, each OFDM symbol fortransmitting the PBCH.

In an embodiment, the system module may be configured to transmit asystem message at a preset resource location in one of the followingmanners.

The system module may be configured to transmit the system message atthe preset resource location via a physical shared channel, or thesystem module may be configured to transmit the system message at thepreset resource location via a physical shared channel and a PBCH.

In an embodiment, the system module may be configured to transmit thesystem message at the preset resource location via the physical sharedchannel in a following manner.

A start OFDM symbol of a physical shared channel carrying the systemmessage in a subframe may be a fixed value, and corresponding availableresource elements may be remaining resources after a fixed virtual cellCRS port is removed.

In an embodiment, the physical shared channel carrying the systemmessage, a synchronization channel and the PBCH may be located ondifferent subframes.

In an embodiment, one or more subframes of the physical shared channelcarrying the system message may include one or more of a subframe #0, asubframe #4, a subframe #5 and a subframe #9.

In an embodiment, the configuration information of the physical sharedchannel carrying the system message may include at least one of:

-   -   a number of bits for carrying the system message in the physical        shared channel;    -   a number of subframes occupied by the physical shared channel;        and    -   information of one or more radio frames occupied by the physical        shared channel.

In an embodiment, the configuration information of terminal access mayinclude:

-   -   whether terminal access is allowed, and/or system state        information, and/or configuration information of terminal uplink        access resources, wherein the system state information may be        used for a terminal to determine whether and/or how to access        the system.

Some embodiments of the disclosure have the beneficial effects asfollows.

According to the system message transmission method and device providedin some embodiments of the disclosure, a system message may betransmitted at a preset resource location, and then a physical downlinkchannel may be transmitted according to the system message. By thecombined use of predetermined transmission and signaling indication, theinterference between signals during spectrum sharing between differentsystems may be reduced, and the occurrence of simultaneous transmissionof different signals over the same resource by different systems may bereduced, thereby ensuring consistency between a system and a terminal,and improving the data transmission performance.

After the drawings and the detailed descriptions are read andunderstood, other aspects may be understood.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a structure diagram of an LTE system frame;

FIG. 2 is a flowchart of a system message transmission method accordingto an embodiment of the disclosure;

FIG. 3 is a structure diagram of a system message transmission deviceaccording to an embodiment of the disclosure; and

FIGS. 4 to 7 are schematic diagrams of locations of narrowband referencesignals according to an embodiment of the disclosure.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The embodiments of the disclosure will be described below in conjunctionwith the drawings. It should be noted that the embodiments in thepresent application and the features in the embodiments may be randomlycombined with each other under the condition of no conflicts.

A radio frame in an LTE system may follow frame structures in aFrequency Division Duplex (FDD) mode and a Time Division Duplex (TDD)mode. The frame structure in the FDD mode is as shown in FIG. 1. A radioframe of 10 ms may consist of twenty slots of 0.5 ms, numbered as 0 to19, and slots 2i and 2i+1 may form a subframe i of 1 ms. For a normalCyclic Prefix (CP), each slot may contain 7 symbols of 66.7 us, whereinthe CP length of the first symbol is 5.21 us, and the CP lengths of theother six symbols are 4.69 us. For an extended CP, each slot may contain6 symbols, and the CP length of all the symbols are 16.67 us.

The number of CRS ports in the LTE system may be 1, 2 or 4, the numberof CSI-RS ports may be 1, 2, 4 or 8. Different numbers of ports maycorrespond to different numbers of resource elements and differentlocations.

A downlink control channel in the LTE system may be located on first nOFDM symbols of a subframe, n being 1, 2, 3 or 4.

The NB-LTE system may adopt single-port transmission. In addition,because the bandwidth of the NB-LTE system is only 200 k, time domainresources occupied by a PBCH and a synchronization signal of the NB-LTEsystem are increased relative to the LTE system. Therefore, a method formapping a PBCH and a synchronization signal of an LTE system is nolonger applicable, and therefore a new method is needed. Moreover,during spectrum sharing between the NB-LTE system and the LTE system, ifthe NB-LTE system does not avoid using resources used by a downlinkcontrol channel and a downlink reference signal of the LTE system andstill works as if no spectrum is shared and resources are independentlyused, the interference between signals of different systems will becaused, and different systems simultaneously may transmit differentsignals over the same resource, thereby affecting UE data reception.Therefore, the NB-LTE system needs to send a system message to an NB-LTEUE to inform of available resources, in order that the NB-LTE system canperform data transmission according to whether a spectrum is shared.Meanwhile, consistency between the NB-LTE system and the NB-LTE UE isalso ensured.

As shown in FIG. 2, an embodiment of the disclosure provides a systemmessage transmission method, including the steps as follows.

A system message may be transmitted at a preset resource location.

A physical downlink channel may be transmitted according to the systemmessage. The system message may include at least one of: frequencydomain location information of a system, configuration information of aphysical shared channel carrying a system message, configurationinformation of terminal access, available resource information of thephysical downlink channel, and radio frame information.

The physical downlink channel may include a physical downlink sharedchannel and/or a physical downlink control channel.

The method in the embodiments of the disclosure may be applied to thefollowing systems: NB-LTE, or other OFDM systems, or other narrowbandsystems. The transmission may include: sending and/or receiving.

Herein, the available resource information of the physical downlinkchannel may include: information of a start OFDM symbol of the physicaldownlink channel in a subframe, and/or information of one or moreunavailable resource elements of the physical downlink channel in asubframe, and/or information of one or more available subframes of thephysical downlink channel.

The information of one or more available subframes of the physicaldownlink channel may be indicated in one of the following alternativemanners. The available subframes may be periodically indicated by usinga bitmap. Alternatively, unavailable subframes may be periodicallyindicated by using a bitmap. For example, J bits may be used to indicatethe availability of each subframe in J subframes. As such, each bitcorrespondingly indicates the availability of one subframe in Jsubframes, for example, 1 represents Available, and 0 representsUnavailable; or, 0 represents Available, and 1 represents Unavailable.Herein, J may be equal to 40, 80, 120, 160 or 240.

The method may further include a step of indicating the information ofthe one or more unavailable resource elements via a CRS port locationand/or a CSI-RS port location. The indication via the CRS port locationand/or the CSI-RS port location may be determined by a number of portsand/or a virtual cell identity.

The system message may be transmitted at the preset resource location inthe following manner.

The system message may be transmitted at the preset resource locationvia a PBCH.

-   -   The PBCH may be located on last Y OFDM symbols of a first slot        of a subframe and first X OFDM symbols of a second slot of the        subframe.

Herein, X may be equal to 4, 5, 6 or 7, and Y may be equal to 0, 1, 2,3, 4 or 5.

Alternatively, the PBCH may be located on any R OFDM symbols in firstpredefined OFDM symbols in a subframe, wherein R may be equal to 4, 5, 6or 8. The first predefined OFDM symbols may include at least one of: asecond OFDM symbol of each slot, a third OFDM symbol of each slot, afourth last OFDM symbol of each slot, and last two OFDM symbols of eachslot.

In an embodiment, when R is equal to 4, the first predefined OFDMsymbols may include last two OFDM symbols of each slot.

In an embodiment, when R is equal to 5, the first predefined OFDMsymbols may include last two OFDM symbols of each slot and a fourth lastOFDM symbol of a second slot, or, the first predefined OFDM symbols mayinclude last two OFDM symbols of each slot and a third OFDM symbol of asecond slot.

In an embodiment, when R is equal to 6, the first predefined OFDMsymbols may include last two OFDM symbols of each slot, and a fourthlast OFDM symbol and a second OFDM symbol of a second slot, or, thefirst predefined OFDM symbols may include last two OFDM symbols of eachslot and a fourth last OFDM symbol of each slot, or, the firstpredefined OFDM symbols may include last two OFDM symbols of each slot,and a second OFDM symbol and a third OFDM symbol of a second slot.

In an embodiment, when R is equal to 8, the first predefined OFDMsymbols may include a second OFDM symbol, a third OFDM symbol and lasttwo OFDM symbols of each slot.

A narrowband reference signal may be transmitted on second predefinedOFDM symbols. The second predefined OFDM symbols may include: last twoOFDM symbols of each slot in a subframe, or, each OFDM symbol fortransmitting the PBCH.

The narrowband reference signal may be used to demodulate the PBCH, andthe narrowband reference signal may be transmitted on one or moresubframes for transmitting the PBCH.

The number of antenna ports of the narrowband reference signal may beequal to 1 or 2. A frequency domain interval of reference signals of thesame port may be 6 subcarriers, and a frequency domain location offsetof reference signals of the same port on adjacent OFDM symbols may be 3subcarriers.

Initial locations of the antenna ports of the narrowband referencesignal may be determined according to a cell identity.

When a normal CP is adopted, as shown in FIG. 4 and FIG. 6, 1 is an OFDMsymbol index.

When an extended CP is adopted, as shown in FIG. 5 and FIG. 7, 1 is anOFDM symbol index.

Herein, R0 indicates a first port, and R1 indicates a second port.

In an embodiment, the first predefined symbols are OFDM symbols on whichno CRS of the LTE system is sent. The transmission of a PBCH on thefirst predefined symbols may reduce influence of a CRS on the PBCH, andmay particularly reduce mutual influence between a new system(narrowband system) and an LTE system on the same spectrum when cellidentities corresponding to the two systems are different. In addition,the adoption of the specific first predefined symbols mentioned abovemainly considers influence of the narrowband reference signal ondemodulation performance. Specifically, an OFDM symbol carrying the PBCHis ensured to the greatest extent to be located on an OFDM symbol onwhich the narrowband reference signal is located. Preferably, the firstpredefined OFDM symbols are selected to be in an intermediate region onan OFDM symbol on which the narrowband reference signal is located, sothat good transmission performance can be obtained.

The PBCH and a synchronization channel may be located on adjacentsubframes. Specifically, the locations of the PBCH and thesynchronization channel may be embodied as one of the followings.

The synchronization channel may be located on a subframe #9, and thePBCH may be located on a subframe #0.

The synchronization channel may be located on a subframe #0, and thePBCH may be located on a subframe #9.

The synchronization channel may be located on a subframe #8, and thePBCH may be located on a subframe #9.

The synchronization channel may be located on a subframe #6, and thePBCH may be located on a subframe #5.

The synchronization channel may be located on a subframe #4, and thePBCH may be located on a subframe #5.

The synchronization channel may be located on a subframe #5, and thePBCH may be located on a subframe #4.

The synchronization channel may be located on a subframe #3, and thePBCH may be located on a subframe #4.

The synchronization channel may be located on a subframe #1, and thePBCH may be located on a subframe #0.

The PBCH may be mapped to T radio frames, and may be located on the sameone or more subframes of each radio frame. T may be equal to 3, 6, 9, 18or 36. The mapping mentioned herein refers to single transmission of thePBCH, and resource definition of a repeated transmission scenario of thePBCH is not involved.

The one or more subframes may include one or more of a subframe #0 of aradio frame, a subframe #4 of a radio frame, a subframe #5 of a radioframe, or a subframe #9 of a radio frame.

The PBCH may be transmitted at an interval of Z1 radio frames, and maybe repeatedly transmitted for Z2 times by every Z1*Z2 radio frames. Inthe embodiment, Z1 may be equal to 4, 6, 8, 12 or 24, and Z2 may beequal to 4, 6, 8, 12 or 16.

The system message may be transmitted at the preset resource location inone of the manners as follows.

The system message may be transmitted at the preset resource locationvia a physical shared channel. Alternatively, the system message may betransmitted at the preset resource location via a physical sharedchannel and a PBCH. In the embodiment, a start OFDM symbol of a physicalshared channel carrying the system message in a subframe may be a fixedvalue, and corresponding available resource elements may be remainingresources after a fixed virtual cell CRS port is removed.

The location of the virtual cell CRS port may be the same as a resourcelocation corresponding to a CRS port (single port, two ports, and fourports) in a relevant LTE system. The resource elements corresponding toa four-port CRS in the relevant LTE system may be selected to serve asresource elements corresponding to the virtual cell CRS port.

The physical shared channel carrying the system message, thesynchronization channel and the PBCH may be located on differentsubframes. One or more subframes of the physical shared channel carryingthe system message may include one or more of a subframe #0, a subframe#4, a subframe #5 and a subframe #9.

For example, the synchronization channel and the PBCH may be located onthe subframe #4 and the subframe #5 (the two subframes may be exchanged)of a radio frame respectively, and the physical shared channel carryingthe system message may be located on the subframe #9 and/or the subframe#0. Alternatively, the synchronization channel and the PBCH may belocated on the subframe #9 and the subframe #0 (the two subframes may beexchanged) of a radio frame respectively, and the physical sharedchannel carrying the system message may be located on the subframe #4and/or the subframe #5.

The physical shared channel carrying the system message may be locatedon W successive radio frames, W being equal to 3, 6, 9 or 12.

As shown in FIG. 3, a system message transmission device may include asystem module and a channel module.

The system module may be configured to transmit a system message at apreset resource location.

The channel module may be configured to transmit a physical downlinkchannel according to the system message. The system message may includeat least one of: frequency domain location information of a system,configuration information of a physical shared channel carrying a systemmessage, configuration information of terminal access, availableresource information of the physical downlink channel, and radio frameinformation.

The available resource information of the physical downlink channel mayinclude: information of a start OFDM symbol of the physical downlinkchannel in a subframe, and/or information of one or more unavailableresource elements of the physical downlink channel in a subframe, and/orinformation of one or more available subframes of the physical downlinkchannel.

The device may further include an indication module.

The indication module may be configured to indicate the information ofthe one or more unavailable resource elements via a CRS port locationand/or a CSI-RS port location.

In an embodiment, the indication via the CRS port location and/or theCSI-RS port location may be determined by a number of ports and/or avirtual cell identity.

Herein, the virtual cell identity is mainly used to indicate a cellidentity of an LTE system during coexistence of a new system (narrowbandsystem) and the LTE system, so that the reference signal location can bedetermined.

The virtual cell identity may include an LTE cell identity or apredefined offset value, the predefined offset value being equal to 0,1, 2, 3, 4 or 5.

The information of one or more available subframes of the physicaldownlink channel may be indicated in one of the following alternativemanners. The available subframes may be periodically indicated by usinga bitmap. Alternatively, unavailable subframes may be periodicallyindicated by using a bitmap. For example, J bits may be used to indicatethe availability of each subframe in J subframes. As such, each bitcorrespondingly indicates the availability of one subframe in Jsubframes, for example, 1 represents Available, and 0 representsUnavailable; or, 0 represents Available, and 1 represents Unavailable.Herein, J may be equal to 40, 80, 120, 160 or 240.

The system module may be configured to transmit a system message at apreset resource location in the following manner.

The system module may be configured to transmit the system message atthe preset resource location via a PBCH.

The preset resource location may be embodied as follows. The PBCH may belocated on last Y OFDM symbols of a first slot of a subframe and first XOFDM symbols of a second slot of the subframe.

In the embodiment, X may be equal to 4, 5, 6 or 7, and Y may be equal to0, 1, 2, 3, 4 or 5.

Alternatively, the PBCH may be located on any R OFDM symbols in firstpredefined OFDM symbols in a subframe, wherein R may be equal to 4, 5, 6or 8. The first predefined OFDM symbols may include at least one of: asecond OFDM symbol of each slot, a fourth last OFDM symbol of each slot,last two OFDM symbols of each slot, and a third OFDM symbol of eachslot.

In an embodiment, when R is equal to 4, the first predefined OFDMsymbols may include last two OFDM symbols of each slot.

In an embodiment, when R is equal to 5, the first predefined OFDMsymbols may include last two OFDM symbols of each slot and a fourth lastOFDM symbol of a second slot, or, the first predefined OFDM symbols mayinclude last two OFDM symbols of each slot and a third OFDM symbol of asecond slot.

In an embodiment, when R is equal to 6, the first predefined OFDMsymbols may include last two OFDM symbols of each slot, and a fourthlast OFDM symbol and a second OFDM symbol of a second slot, or, thefirst predefined OFDM symbols may include last two

OFDM symbols of each slot and a fourth last OFDM symbol of each slot,or, the first predefined OFDM symbols may include last two OFDM symbolsof each slot, and a second OFDM symbol and a third OFDM symbol of asecond slot.

In an embodiment, when R is equal to 8, the first predefined OFDMsymbols may include a second OFDM symbol, a third OFDM symbol and lasttwo OFDM symbols of each slot.

A narrowband reference signal may be transmitted on second predefinedOFDM symbols. The second predefined OFDM symbols may include: last twoOFDM symbols of each slot in a subframe, or, each OFDM symbol fortransmitting the PBCH.

The narrowband reference signal may be used to demodulate the PBCH, andthe narrowband reference signal may be transmitted on one or moresubframes for transmitting the PBCH.

The number of antenna ports of the narrowband reference signal may beequal to 1 or 2. A frequency domain interval of reference signals of thesame port may be 6 subcarriers, and a frequency domain location offsetof reference signals of the same port on adjacent OFDM symbols may be 3subcarriers.

Initial locations of the antenna ports of the narrowband referencesignal may be determined according to a cell identity.

The PBCH and a synchronization channel may be located on adjacentsubframes.

The PBCH and a synchronization channel may be located on adjacentsubframes. Specifically, the locations of the PBCH and thesynchronization channel may be embodied as one of the followings.

The synchronization channel may be located on a subframe #9, and thePBCH may be located on a subframe #0.

The synchronization channel may be located on a subframe #0, and thePBCH may be located on a subframe #9.

The synchronization channel may be located on a subframe #8, and thePBCH may be located on a subframe #9.

The synchronization channel may be located on a subframe #6, and thePBCH may be located on a subframe #5.

The synchronization channel may be located on a subframe #4, and thePBCH may be located on a subframe #5.

The synchronization channel may be located on a subframe #5, and thePBCH may be located on a subframe #4.

The synchronization channel may be located on a subframe #3, and thePBCH may be located on a subframe #4.

The synchronization channel may be located on a subframe #1, and thePBCH may be located on a subframe #0.

The PBCH may be mapped to T radio frames, and may be located on the sameone or more subframes of each radio frame.

The one or more subframes may include one or more of a subframe #0 of aradio frame, a subframe #4 of a radio frame, a subframe #5 of a radioframe, or a subframe #9 of a radio frame.

The PBCH of the system module may be transmitted at an interval of Z1radio frames, and may be repeatedly transmitted for Z2 times by everyZ1*Z2 radio frames.

In the embodiment, Z1 may be equal to 4, 6, 8, 12 or 24, and Z2 may beequal to 4, 6, 8, 12 or 16.

The system module may be configured to transmit a system message at apreset resource location in one of the following manners.

The system module may be configured to transmit the system message atthe preset resource location via a physical shared channel.Alternatively, the system module may be configured to transmit thesystem message at the preset resource location via a physical sharedchannel and a PBCH.

The system message may be transmitted at the preset resource locationvia the physical shared channel in a following manner.

A start OFDM symbol of a physical shared channel carrying the systemmessage in a subframe may be a fixed value, and corresponding availableresource elements may be remaining resources after a fixed virtual cellCRS port is removed.

The physical shared channel carrying the system message, thesynchronization channel and the PBCH may be located on differentsubframes.

One or more subframes of the physical shared channel carrying the systemmessage may include one or more of a subframe #0, a subframe #4, asubframe #5 and a subframe #9.

First Embodiment

The information of the start OFDM symbol may include two or four states.

In the embodiment, a 1 bit signaling may be included to representavailable resource information of the physical downlink channel.

Two resource mapping modes may be predefined and indicated by 1 bitsignaling. The available resource information of the physical downlinkchannel can be indicated by the signaling.

For example, the first mapping mode may include: a physical downlinkchannel is mapped starting from a first OFDM symbol of a subframe,and/or corresponding available resource elements may be remainingresources after a fixed single-port virtual cell CRS is removed; and thesecond mapping mode may include: a physical downlink channel is mappedstarting from a fourth OFDM symbol of a subframe, and/or correspondingavailable resource elements may be remaining resources after a fixedfour-port virtual cell CRS is removed.

Alternatively,

-   -   the first mapping mode may include: a physical downlink channel        is mapped starting from a first OFDM symbol of a subframe,        and/or corresponding available resource elements may be        remaining resources after a fixed single-port virtual cell CRS        is removed; and the second mapping mode may include: a physical        downlink channel is mapped starting from a fifth OFDM symbol of        a subframe, and/or corresponding available resource elements may        be remaining resources after a fixed four-port virtual cell CRS        is removed.

An alternative manner is: defining signaling respectively for theinformation of the start OFDM symbol of the physical downlink channel ina subframe and the information of one or more available resourceelements of the physical downlink channel in a subframe.

The information of the start OFDM symbol of the physical downlinkchannel in a subframe may occupy 1 bit, indicating a first OFDM symbol,or a k^(th) OFDM symbol, where k is equal to 3, 4 or 5 optionally.Alternatively, the information of the start OFDM symbol of the physicaldownlink channel in a subframe may occupy 2 bits, indicating first,second, third or fourth OFDM symbol.

The information of one or more available resource elements of thephysical downlink channel in a subframe may be indicated via a CRS portlocation and/or a CSI-RS port location. The CRS port location may be 1,2 or 4, or, the CRS port location may be 1 or 4.

The CSI-RS port location may be Null, or may be one or more selectedCSI-RS resource configuration indexes in a relevant LTE system. TheCSI-RS port location being Null represents that no CSI-RS is sent.

Second Embodiment

Because a CRS is only located on first two OFDM symbols on a subframe ofan LTE system Multimedia Broadcast multicast service Signal FrequencyNetwork (MBSFN) and a PBCH needs to be demodulated by the CRS and/or asynchronization channel, the PBCH may be located on non-MBSFN subframes(0, 4, 5, 9).

Locating of a synchronization signal on an MBSFN subframe may avoidinfluence of a CRS of an LTE system on the synchronization signal.However, this may limit multicast service transmission. Therefore, aPBCH mapping solution is provided for two scenarios, i.e., a scenario inwhich the synchronization signal is located on MBSFN subframes (1, 2, 3,6, 7, 8) and a scenario in which the synchronization signal is notlocated on MBSFN subframes (0, 4, 5, 9). The mapping solution mayinclude transmitting the system message at the preset resource locationvia a PBCH.

The preset resource location may be embodied as follows. The PBCH may belocated on last Y OFDM symbols of a first slot of a subframe and first XOFDM symbols of a second slot of the subframe.

In the embodiment, X may be equal to 4, 5, 6 or 7, and Y may be equal to0, 1, 2, 3, 4 or 5.

Alternatively, the PBCH may be located on any R OFDM symbols in firstpredefined OFDM symbols in a subframe, wherein R may be equal to 4, 5, 6or 8, and the first predefined OFDM symbols may include at least one of:a second OFDM symbol of each slot, a fourth last OFDM symbol of eachslot, last two OFDM symbols of each slot, and a third OFDM symbol ofeach slot.

The above description indicates that a PBCH may be located on anadjacent subframe different from the subframe of a synchronizationchannel. However, it is not limited that a PBCH is present on anadjacent subframe of a synchronization channel for sure. The number ofsubframes occupied by the synchronization channel may be greater than orequal to the number of subframes occupied by the PBCH.

For example, primary synchronization signals may be located on subframes#k of odd-indexed radio frames, and secondary synchronization signalsmay be located on subframes #k of even-indexed radio frames, wherein kmay be equal to 1, 2, 3, 6, 7 or 8. Alternatively, primarysynchronization signals may be located on subframes #k of even-indexedradio frames, and secondary synchronization signals may be located onsubframes #k of odd-indexed radio frames, wherein k may be equal to 1,2, 3, 6, 7 or 8. The subframes may be numbered starting from 0.

Alternatively, the primary synchronization signals may be located onsubframes #k of odd-indexed radio frames, and the secondarysynchronization signals may be located on subframes #k of even-indexedradio frames, wherein k may be equal to 0, 4, 5 or 9. Alternatively, theprimary synchronization signals may be located on subframes #k ofeven-indexed radio frames, and the secondary synchronization signals maybe located on subframes #k of odd-indexed radio frames, wherein k may beequal to 0, 4, 5 or 9. The subframes may be numbered starting from 0.

The PBCH may be mapped to a subframe #k of each radio frame by taking 6successive radio frames as a period, wherein k may be equal to 0, 4, 5or 9. Alternatively, the PBCH may be mapped to subframes #k of firstthree radio frames within each period by taking 6 successive radioframes as a period, wherein k may be equal to 0, 4, 5 or 9.Alternatively, the PBCH may be mapped to a subframe #k of each radioframe by taking 8 successive radio frames as a period, wherein k may beequal to 0, 4, 5 or 9.

Third Embodiment

In this embodiment, the transmission may include: sending and/orreceiving.

The sending process may include steps as follows. An NB-LTE base stationsends a system message to an NB-LTE terminal, and the NB-LTE basestation sends a physical downlink channel to the NB-LTE terminalaccording to the system message.

The NB-LTE base station may send a system message to the NB-LTE terminalat a preset resource location.

The NB-LTE base station may send a physical downlink channel to theNB-LTE terminal according to the system message. The system message mayinclude at least one of: frequency domain location information of asystem, configuration information of a physical shared channel carryinga system message, configuration information of terminal access,available resource information of the physical downlink channel, andradio frame information.

The NB-LTE frequency domain location information is mainly used togenerate a CRS sequence. The CRS sequence may be generated based on anLTE system CRS sequence generation method. Therefore, it may be neededto determine a frequency domain location corresponding to NB-LTE togenerate the CRS sequence.

The configuration information of a physical shared channel carrying asystem message may include at least one of: a number of bits forcarrying the system message in the physical shared channel, a number ofsubframes occupied by the physical shared channel, and information ofone or more radio frames occupied by the physical shared channel.

The configuration information of terminal access may include: whetherterminal access is allowed, and/or system state information, and/orconfiguration information of terminal uplink access resources.

The system state information may be used for a terminal to determinewhether and/or how to access the system.

The available resource information of the physical downlink channel mayinclude:

information of a start OFDM symbol of the physical downlink channel in asubframe, and/or information of one or more unavailable resourceelements of the physical downlink channel in a subframe, and/orinformation of one or more available subframes of the physical downlinkchannel.

The information of one or more available subframes of the physicaldownlink channel may be indicated in one of the following manners. Theavailable subframes may be indicated periodically by using a bitmap.Alternatively, unavailable subframes may be indicated periodically byusing a bitmap. For example, J bits may be used to indicate theavailability of each subframe in J subframes. As such, each bitcorrespondingly indicates the availability of one subframe in Jsubframes, for example, 1 represents Available, and 0 representsUnavailable; or, 0 represents Available, and 1 represents Unavailable.Herein, J may be 40, 80, 120, 160 or 240.

The information of the one or more unavailable resource elements may beindicated via a CRS port location and/or a CSI-RS port location. Theindication via the CRS port location and/or the CSI-RS port location maybe determined by a number of ports and/or a virtual cell identity.

The system message may be transmitted at a preset resource location inthe following manner. The system message may be transmitted at a presetresource location via a PBCH.

The preset resource location may be embodied as follows. The PBCH may belocated on last Y OFDM symbols of a first slot of a subframe and first XOFDM symbols of a second slot of the subframe.

In the embodiment, X may be equal to 4, 5, 6 or 7, and Y may be equal to0, 1, 2, 3, 4 or 5.

The PBCH may be located on any R OFDM symbols in first predefined OFDMsymbols in a subframe, wherein R may be equal to 4, 5, 6 or 8. The firstpredefined OFDM symbols may include at least one of: a second OFDMsymbol of each slot, a fourth last OFDM symbol of each slot, last twoOFDM symbols of each slot, and a third OFDM symbol of each slot.

In an embodiment, when R is equal to 4, the first predefined OFDMsymbols may include last two OFDM symbols of each slot.

In an embodiment, when R is equal to 5, the first predefined OFDMsymbols may include last two OFDM symbols of each slot and a fourth lastOFDM symbol of a second slot, or, the first predefined OFDM symbols mayinclude last two OFDM symbols of each slot and a third OFDM symbol of asecond slot.

In an embodiment, when R is equal to 6, the first predefined OFDMsymbols may include last two OFDM symbols of each slot, and a fourthlast OFDM symbol and a second OFDM symbol of a second slot, or, thefirst predefined OFDM symbols may include last two OFDM symbols of eachslot and a fourth last OFDM symbol of each slot, or, the firstpredefined OFDM symbols may include last two OFDM symbols of each slot,and a second OFDM symbol and a third OFDM symbol of a second slot.

In an embodiment, when R is equal to 8, the first predefined OFDMsymbols may include a second OFDM symbol, a third OFDM symbol and lasttwo OFDM symbols of each slot.

The PBCH and a synchronization channel may be located on adjacentsubframes.

The PBCH and a synchronization channel may be located on adjacentsubframes which may be embodied as one of the following:

-   -   the synchronization channel may be located on a subframe #9, and        the PBCH may be located on a subframe #0;    -   the synchronization channel may be located on a subframe #0, and        the PBCH may be located on a subframe #9;    -   the synchronization channel may be located on a subframe #8, and        the PBCH may be located on a subframe #9;    -   the synchronization channel may be located on a subframe #6, and        the PBCH may be located on a subframe #5;    -   the synchronization channel may be located on a subframe #4, and        the PBCH may be located on a subframe #5;    -   the synchronization channel may be located on a subframe #5, and        the PBCH may be located on a subframe #4;    -   the synchronization channel may be located on a subframe #3, and        the PBCH may be located on a subframe #4; and    -   the synchronization channel may be located on a subframe #1, and        the PBCH may be located on a subframe #0.

The preset resource location may be embodied as follows. The PBCH may bemapped to T radio frames, and may be located on the same one or moresubframes of each radio frame.

The one or more subframes may include one or more of a subframe #0 of aradio frame, a subframe #4 of a radio frame, a subframe #5 of a radioframe, or a subframe #9 of a radio frame.

The PBCH may be transmitted at an interval of Z1 radio frames, and maybe repeatedly transmitted for Z2 times by every Z1*Z2 radio frames.

In the embodiment, Z1 may be equal to 4, 6, 8, 12 or 24, and Z2 may beequal to 4, 6, 8, 12 or 16.

The system message may be transmitted at a preset resource location inone of the following manners.

The system message may be transmitted at a preset resource location viaa physical shared channel. Alternatively, the system message may betransmitted at a preset resource location via a physical shared channeland a PBCH.

The system message may be transmitted at a preset resource location viaa physical shared channel in the following manner.

A start OFDM symbol of a physical shared channel carrying the systemmessage in a subframe may be a fixed value, and corresponding availableresource elements may be remaining resources after a fixed virtual cellCRS port is removed.

The physical shared channel carrying the system message, thesynchronization channel and the PBCH may be located on differentsubframes.

One or more subframes of the physical shared channel carrying the systemmessage may include one or more of a subframe #0, a subframe #4, asubframe #5 and a subframe #9.

The receiving process may include the following steps. The NB-LTEterminal receives a system message sent by the NB-LTE base station, andthe NB-LTE terminal receives a physical downlink channel according tothe system message.

Herein, the system message may include at least one of: frequency domainlocation information of a system, configuration information of aphysical shared channel carrying a system message, configurationinformation of terminal access, available resource information of thephysical downlink channel, and radio frame information.

The available resource information of the physical downlink channel mayinclude: information of a start OFDM symbol of the physical downlinkchannel in a subframe, and/or information of one or more unavailableresource elements of the physical downlink channel in a subframe, and/orinformation of one or more available subframes of the physical downlinkchannel.

The information of one or more available subframes of the physicaldownlink channel may be indicated in one of the following alternativemanners. The available subframes may be indicated periodically by usinga bitmap. Alternatively, the unavailable subframes may be indicatedperiodically by using a bitmap. For example, J bits may be used toindicate the availability of each subframe in J subframes. As such, eachbit correspondingly indicates the availability of one subframe in Jsubframes, for example, 1 represents Available, and 0 representsUnavailable; or, 0 represents Available, and 1 represents Unavailable.Herein, J may be 40, 80, 120, 160 or 240.

The information of the one or more unavailable resource elements may beindicated via a CRS port location and/or a CSI-RS port location. Theindication via the CRS port location and/or the CSI-RS port location maybe determined by a number of ports and/or a virtual cell identity.

The system message may be transmitted at a preset resource location inthe following manner. The system message may be transmitted at a presetresource location via a PBCH. The preset resource location may beembodied as follows. The PBCH may be located on last Y OFDM symbols of afirst slot of a subframe and first X OFDM symbols of a second slot ofthe subframe.

In the embodiment, X may be equal to 4, 5, 6 or 7, and Y may be equal to0, 1, 2, 3, 4 or 5.

The PBCH may be located on any R OFDM symbols in first predefined OFDMsymbols in a subframe, wherein R may be equal to 4, 5, 6 or 8. The firstpredefined OFDM symbols may include at least one of: a second OFDMsymbol of each slot, a fourth last OFDM symbol of each slot, last twoOFDM symbols of each slot, and a third OFDM symbol of each slot.

In an embodiment, when R is equal to 4, the first predefined OFDMsymbols may include last two OFDM symbols of each slot.

In an embodiment, when R is equal to 5, the first predefined OFDMsymbols may include last two OFDM symbols of each slot and a fourth lastOFDM symbol of a second slot, or, the first predefined OFDM symbols mayinclude last two OFDM symbols of each slot and a third OFDM symbol of asecond slot.

In an embodiment, when R is equal to 6, the first predefined OFDMsymbols may include last two OFDM symbols of each slot, and a fourthlast OFDM symbol and a second OFDM symbol of a second slot, or, thefirst predefined OFDM symbols may include last two OFDM symbols of eachslot and a fourth last OFDM symbol of each slot, or, the firstpredefined OFDM symbols may include last two OFDM symbols of each slot,and a second

OFDM symbol and a third OFDM symbol of a second slot.

In an embodiment, when R is equal to 8, the first predefined OFDMsymbols may include a second OFDM symbol, a third OFDM symbol and lasttwo OFDM symbols of each slot.

The PBCH and a synchronization channel may be located on adjacentsubframes.

The PBCH and a synchronization channel may be located on adjacentsubframes which may be embodied as one of the following:

-   -   the synchronization channel may be located on a subframe #9, and        the PBCH may be located on a subframe #0;    -   the synchronization channel may be located on a subframe #0, and        the PBCH may be located on a subframe #9;    -   the synchronization channel may be located on a subframe #8, and        the PBCH may be located on a subframe #9;    -   the synchronization channel may be located on a subframe #6, and        the PBCH may be located on a subframe #5;    -   the synchronization channel may be located on a subframe #4, and        the PBCH may be located on a subframe #5;    -   the synchronization channel may be located on a subframe #5, and        the PBCH may be located on a subframe #4;    -   the synchronization channel may be located on a subframe #3, and        the PBCH may be located on a subframe #4; and    -   the synchronization channel may be located on a subframe #1, and        the PBCH may be located on a subframe #0.

The preset resource location may be embodied as follows. The PBCH may bemapped to T radio frames, and may be located on the same one or moresubframes of each radio frame.

The one or more subframes may include one or more of a subframe #0 of aradio frame, a subframe #4 of a radio frame, a subframe #5 of a radioframe, or a subframe #9 of a radio frame.

The PBCH may be transmitted at an interval of Z1 radio frames, and maybe repeatedly transmitted for Z2 times by every Z1*Z2 radio frames.

In the embodiment, Z1 may be equal to 4, 6, 8, 12 or 24, and Z2 may beequal to 4, 6, 8, 12 or 16.

The system message may be transmitted at a preset resource location inone of the following manners.

The system message may be transmitted at a preset resource location viaa physical shared channel. Alternatively, the system message may betransmitted at a preset resource location via a physical shared channeland a PBCH.

The system message may be transmitted at a preset resource location viaa physical shared channel in the following manner.

A start OFDM symbol of a physical shared channel carrying the systemmessage in a subframe may be a fixed value, and corresponding availableresource elements may be remaining resources after a fixed virtual cellCRS port is removed.

The physical shared channel carrying the system message, thesynchronization channel and the PBCH may be located on differentsubframes.

One or more subframes of the physical shared channel carrying the systemmessage may include one or more of a subframe #0, a subframe #4, asubframe #5 and a subframe #9.

Fourth Embodiment

The system message may include available resource information and radioframe information of the physical downlink channel and may be carried bya PBCH.

Two resource mapping modes are predefined, and indicated by 1 bitsignaling. The available resource information of the physical downlinkchannel may be indicated by the signaling.

The available resource information of the physical downlink channel mayinclude information of a start OFDM symbol of the physical sharedchannel in a subframe and information of one or more available resourceelements of the physical shared channel in a subframe.

A first mapping mode may include: a physical downlink channel is mappedstarting from a first OFDM symbol of a subframe, and correspondingavailable resource elements may be remaining resources after a fixedsingle-port virtual cell CRS is removed.

A second mapping mode may include: a physical downlink channel is mappedstarting from a fourth OFDM symbol of a subframe, and correspondingavailable resource elements may be remaining resources after a fixedfour-port virtual cell CRS is removed.

The synchronization channel may be located on a subframe #9 of a radioframe, and the PBCH may be located on a subframe #0 of the radio frame.Alternatively, the PBCH may be located on a subframe #9 of a radioframe, and the synchronization channel may be located on a subframe #0of the radio frame. Alternatively, the synchronization channel may belocated on a subframe #4 of a radio frame, and the PBCH may be locatedon a subframe #5 of the radio frame. Alternatively, the synchronizationchannel may be located on a subframe #5 of a radio frame, and the PBCHmay be located on a subframe #4 of the radio frame.

The PBCH may be located on last Y OFDM symbols of a first slot of asubframe and first X OFDM symbols of a second slot of the subframe,wherein X may be equal to 4, 5, 6 or 7, and Y may be equal to 0, 1, 2,3, 4 or 5.

The PBCH may be transmitted at an interval of Z1 radio frames, and maybe repeatedly transmitted for Z2 times by every Z1*Z2 radio frames.Herein, Z1 may be equal to 6, 8, 12 or 24, and Z2 may be equal to 4, 6,8, 12 or 16.

For example, the symbol may include first four or five OFDM symbols of asecond slot of a subframe, or, the last OFDM symbol of a first slot of asubframe and first four OFDM symbols of a second slot of the subframe,or, last two OFDM symbols of a first slot of a subframe and first fourOFDM symbols of a second slot of the subframe, or, last two OFDM symbolsof a first slot of a subframe and first six OFDM symbols of a secondslot of the subframe, or, last three OFDM symbols of a first slot of asubframe and first five OFDM symbols of a second slot of the subframe,or, last five OFDM symbols of a first slot of a subframe and first sevenOFDM symbols of a second slot of the subframe, or, last three OFDMsymbols of a first slot of a subframe and all OFDM symbols of a secondslot of the subframe.

The mapping method may reduce the number of subframes for mapping a PBCHand reduce the transmission delay, and different CP types may adopt aunified design solution to the greatest extent.

The PBCH may be mapped to six successive radio frames, and may belocated on a fixed subframe #Y1 of each radio frame. Y1 may be equal toone or more of 0, 4, 5 and 9. The PBCH may be transmitted for four timeswithin each period by taking 24 radio frames as a period.

Alternatively, the PBCH may be mapped to first three successive radioframes of every six radio frames, and may be located on a fixed subframe#Y1 of each radio frame. Y1 may be equal to one or more of 0, 4, 5 and9. The PBCH may be transmitted for four times within each period bytaking 24 radio frames as a period.

Alternatively, the PBCH may be mapped to eight successive radio frames,and may be located on a fixed subframe #Y1 of each radio frame. Y1 maybe equal to one or more of 0, 4, 5 and 9. The PBCH may be transmittedfor eight times within each period by taking 64 radio frames as aperiod.

Alternatively, the PBCH may be mapped to eight successive radio frames,and may be located on a fixed subframe #Y1 of each radio frame. Y1 maybe equal to one or more of 0, 4, 5 and 9. The PBCH may be transmittedfor six times within each period by taking 48 radio frames as a period.

Alternatively, the PBCH may be mapped to eight successive radio frames,and may be located on a fixed subframe #Y1 of each radio frame. Y1 maybe equal to one or more of 0, 4, 5 and 9. The PBCH may be transmittedfor 12 times within each period by taking 96 radio frames as a period.

Fifth Embodiment

The system message may include frequency domain location information ofa system, configuration information of a physical shared channelcarrying a system message, configuration information of terminal access,and radio frame information. The system message may be carried by aPBCH.

The synchronization channel may be located on a subframe #8 of a radioframe, and the PBCH may be located on a subframe #9 of the radio frame.Alternatively, the synchronization channel may be located on a subframe#6 of a radio frame, and the PBCH may be located on a subframe #5 of theradio frame. Alternatively, the synchronization channel may be locatedon a subframe #3 of a radio frame, and the PBCH may be located on asubframe #4 of the radio frame. Alternatively, the synchronizationchannel may be located on a subframe #1 of a radio frame, and the PBCHmay be located on a subframe #0 of the radio frame.

The PBCH may be located on last Y OFDM symbols of a first slot of asubframe and first X OFDM symbols of a second slot of the subframe,wherein X may be equal to 4, 5, 6 or 7, and Y may be equal to 0, 1, 2,3, 4 or 5.

The PBCH may be transmitted at an interval of Z1 radio frames, and maybe repeatedly transmitted for Z2 times by every Z1*Z2 radio frames. Z1may be equal to 6, 8, 12 or 24, and Z2 may be equal to 4, 6, 8, 12 or16.

For example, the symbol may include first four or five OFDM symbols of asecond slot of a subframe, or, the last OFDM symbol of a first slot of asubframe and first four OFDM symbols of a second slot of the subframe,or, last two OFDM symbols of a first slot of a subframe and first fourOFDM symbols of a second slot of the subframe, or, last two OFDM symbolsof a first slot of a subframe and first six OFDM symbols of a secondslot of the subframe, or, last three OFDM symbols of a first slot of asubframe and first five OFDM symbols of a second slot of the subframe,or, last five OFDM symbols of a first slot of a subframe and first sevenOFDM symbols of a second slot of the subframe, or, last three OFDMsymbols of a first slot of a subframe and all OFDM symbols of a secondslot of the subframe.

The mapping method may reduce the number of subframes for mapping a PBCHand reduce the transmission delay. Different CP types may adopt aunified design solution to the greatest extent.

The PBCH may be mapped to six successive radio frames, and may belocated on a fixed subframe #Y1 of each radio frame. Y1 may be equal toone or more of 0, 4, 5 and 9. The PBCH may be transmitted for four timeswithin each period by taking 24 radio frames as a period.

Alternatively, the PBCH may be mapped to first three successive radioframes of every six radio frames, and may be located on a fixed subframe#Y1 of each radio frame. Y1 may be equal to one or more of 0, 4, 5 and9. The PBCH may be transmitted for four times within each period bytaking 24 radio frames as a period.

Sixth Embodiment

The system message may include available resource information of thephysical downlink channel, radio frame information, frequency domainlocation information of a system, configuration information of aphysical shared channel carrying a system message, and configurationinformation of terminal access.

The radio frame information, the NB-LTE frequency domain locationinformation and the configuration information of the physical sharedchannel carrying the system message may be carried by a PBCH.

The synchronization channel may be located on a subframe #8 of a radioframe, and the PBCH may be located on a subframe #9 of the radio frame.Alternatively, the synchronization channel may be located on a subframe#6 of a radio frame, and the PBCH may be located on a subframe #5 of theradio frame. Alternatively, the synchronization channel may be locatedon a subframe #3 of a radio frame, and the PBCH may be located on asubframe #4 of the radio frame. Alternatively, the synchronizationchannel may be located on a subframe #1 of a radio frame, and the PBCHmay be located on a subframe #0 of the radio frame.

The PBCH may be located on last Y OFDM symbols of a first slot of asubframe and first X OFDM symbols of a second slot of the subframe,wherein X may be equal to 4, 5, 6 or 7, and Y may be equal to 0, 1, 2,3, 4 or 5.

The PBCH may be transmitted at an interval of Z1 radio frames, and maybe repeatedly transmitted for Z2 times by every Z1*Z2 radio frames. Z1may be equal to 6, 8, 12 or 24, and Z2 may be equal to 4, 6, 8, 12 or16.

For example, the symbol may include first four or five OFDM symbols of asecond slot of a subframe, or, the last OFDM symbol of a first slot of asubframe and first four OFDM symbols of a second slot of the subframe,or, last two OFDM symbols of a first slot of a subframe and first fourOFDM symbols of a second slot of the subframe, or, last two OFDM symbolsof a first slot of a subframe and first six OFDM symbols of a secondslot of the subframe, or, last three OFDM symbols of a first slot of asubframe and first five OFDM symbols of a second slot of the subframe,or, last five OFDM symbols of a first slot of a subframe and first sevenOFDM symbols of a second slot of the subframe, or, last three OFDMsymbols of a first slot of a subframe and all OFDM symbols of a secondslot of the subframe.

The mapping method may reduce the number of subframes for mapping a PBCHand reduce the transmission delay. Different CP types may adopt aunified design solution to the greatest extent.

The PBCH may be mapped to six successive radio frames, and may belocated on a fixed subframe #Y1 of each radio frame. Y1 may be equal toone or more of 0, 4, 5 and 9. The PBCH may be transmitted for four timeswithin each period by taking 24 radio frames as a period.

Alternatively, the PBCH may be mapped to first three successive radioframes of every six radio frames, and may be located on a fixed subframe#Y1 of each radio frame. Y1 may be equal to one or more of 0, 4, 5 and9. The PBCH may be transmitted for four times within each period bytaking 24 radio frames as a period.

The available resource information of the physical downlink channel andthe configuration information of terminal access may be carried by aPBCH. A start OFDM symbol of a physical shared channel carrying thesystem message in a subframe may be a first OFDM symbol, andcorresponding available resource elements may be remaining resourcesafter removing a 4-port virtual cell CRS port. The physical downlinkshared channel may be transmitted in a single-port manner.

Signaling is defined respectively for the information of the start OFDMsymbol of the physical downlink channel in a subframe and information ofone or more available resource elements of the physical downlink channelin a subframe.

The information of the start OFDM symbol of the physical downlinkchannel in a subframe may occupy 1 bit, indicating a first OFDM symbol,or a k^(th) OFDM symbol, where k may be equal to 3, 4 or 5.Alternatively, the information of the start OFDM symbol of the physicaldownlink channel in a subframe may occupy 2 bits, indicating the first,second, third or fourth OFDM symbol.

The information of one or more available resource elements of thephysical downlink channel in a subframe may be indicated via a CRS portlocation and/or a CSI-RS port location.

Herein, the CRS port location may be 1, 2 or 4, or, the CRS portlocation may be 1 or 4. The CSI-RS port location may include Null, ormay be one or more selected CSI-RS resource configuration indexes in arelevant LTE system.

The physical shared channel carrying the system message, thesynchronization channel and the PBCH may be located on differentsubframes.

The one or more subframes of the physical shared channel carrying thesystem message may include one or more of a subframe #0, a subframe #4,a subframe #5 and a subframe #9.

The physical downlink channel may include a physical downlink sharedchannel and/or a physical downlink control channel.

Another embodiment of the disclosure provides a computer storage mediumin which a computer-executable instruction is stored. Thecomputer-executable instruction is used to execute the method in theabove-mentioned embodiments.

Those of ordinary skill in the art may understand that all or some ofthe steps in the above-mentioned method may be completed by instructingrelevant hardware (e.g., processor) through a program. The program maybe stored in a computer-readable storage medium such as a read-onlymemory, a magnetic disk or an optical disk. Alternatively, all or someof the steps in the above-mentioned embodiments may be implemented byusing one or more integrated circuits. Accordingly, each module/unit inthe above-mentioned embodiments may be implemented in a form ofhardware, and for example, corresponding functions thereof areimplemented by means of an integrated circuit. Each module/unit may alsobe implemented in a form of software function module, and for example,corresponding functions thereof are implemented by executingprograms/instructions stored in a memory by the processor. Thedisclosure is not limited to the combination of hardware and software inany specific form.

Although the disclosure provides the implementation manners as above,the content is only the implementation manners illustrated forconvenience of understanding the disclosure, and is not intended tolimit the disclosure. Any person skilled in the art may make anymodifications and changes about an implementation form and detailswithout departing from the scope disclosed in the disclosure. However,the scope of protection limited by the disclosure should be determinedwith reference to the scope defined by the appended claims.

INDUSTRIAL APPLICABILITY

The above-mentioned technical solutions can reduce the interferencebetween signals during spectrum sharing between different systems andreduce the occurrence of simultaneous transmission of different signalsover the same resource by different systems, thereby ensuringconsistency between a system and a terminal, and improving the datatransmission performance.

What is claimed is:
 1. A system message transmission method, comprising:transmitting a physical shared channel carrying a system message,wherein the system message comprises available resource information ofthe physical downlink channel, wherein the available resourceinformation of the physical downlink channel comprises: information ofone or more unavailable resource elements of a physical downlink channelin a subframe; wherein the method further comprises: indicating theinformation of the one or more unavailable resource elements via aCell-specific Reference Signal (CRS) port location.
 2. The method asclaimed in claim 1, wherein the system message further comprises systemstate information, the system state information is used for a terminalto determine whether and/or how to access the system.
 3. The method asclaimed in claim 1, wherein the system message further comprisesinformation of one or more available subframes of the physical downlinkchannel.
 4. The method as claimed in claim 1, wherein the indication viathe CRS port location is determined by a number of ports and/or avirtual cell identity.
 5. The method as claimed in claim 1, wherein themethod further comprises: indicating the information of the one or moreunavailable resource elements via the CRS port location and a ChannelState Information Reference Signal (CSI-RS) port location.
 6. The methodas claimed in claim 5, wherein the indication via the CSI-RS portlocation is determined by a number of ports and/or a virtual cellidentity.
 7. A system message transmission device, comprising: a systemmodule, configured to transmit a physical shared channel carrying asystem message, wherein the system message comprises available resourceinformation of the physical downlink channel, wherein the availableresource information of the physical downlink channel comprises:information of one or more unavailable resource elements of a physicaldownlink channel in a subframe; wherein the device further comprises: anindication module, configured to indicate the information of the one ormore unavailable resource elements via a Cell-specific Reference Signal(CRS) port location.
 8. The device as claimed in claim 7, wherein thesystem message further comprises system state information, the systemstate information is used for a terminal to determine whether and/or howto access the system.
 9. The device as claimed in claim 7, wherein thesystem message further comprises information of one or more availablesubframes of the physical downlink channel.
 10. The device as claimed inclaim 7, wherein the indication via the CRS port location is determinedby a number of ports and/or a virtual cell identity.
 11. The device asclaimed in claim 7, wherein the indication module is further configuredto indicate the information of the one or more unavailable resourceelements via the CRS port location and a Channel State InformationReference Signal (CSI-RS) port location.
 12. The device as claimed inclaim 11, wherein the indication via the CSI-RS port location isdetermined by a number of ports and/or a virtual cell identity
 13. Asystem message transmission method, comprising: receiving a physicalshared channel carrying a system message, wherein the system messagecomprises available resource information of the physical downlinkchannel, wherein the available resource information of the physicaldownlink channel comprises: information of one or more unavailableresource elements of a physical downlink channel in a subframe; whereinthe information of the one or more unavailable resource elements isindicated via a Cell-specific Reference Signal (CRS) port location. 14.The method as claimed in claim 13, wherein the system message furthercomprises system state information, the system state information is usedfor a terminal to determine whether and/or how to access the system. 15.The method as claimed in claim 13, wherein the system message furthercomprises information of one or more available subframes of the physicaldownlink channel.
 16. The method as claimed in claim 13, wherein theindication via the CRS port location is determined by a number of portsand/or a virtual cell identity.
 17. The method as claimed in claim 13,wherein the information of the one or more unavailable resource elementsis indicated via the CRS port location and a Channel State InformationReference Signal (CSI-RS) port location.
 18. The method as claimed inclaim 17, wherein the indication via the CSI-RS port location isdetermined by a number of ports and/or a virtual cell identity.
 19. Asystem message transmission device, configured to: receive a physicalshared channel carrying a system message, wherein the system messagecomprises available resource information of the physical downlinkchannel, wherein the available resource information of the physicaldownlink channel comprises: information of one or more unavailableresource elements of a physical downlink channel in a subframe, theinformation of the one or more unavailable resource elements isindicated via a Cell-specific Reference Signal (CRS) port location. 20.The device as claimed in claim 19, wherein the indication via the CRSport location is determined by a number of ports and/or a virtual cellidentity.